From f11ca377f471d29a1e9098cb0dd0a9e83568f734 Mon Sep 17 00:00:00 2001
From: Christian Rocha <christian@rocha.is>
Date: Tue, 21 Jul 2020 16:49:27 -0400
Subject: [PATCH] Add clipboard paste support to textarea

---
 go.mod                 |  1 +
 go.sum                 |  2 ++
 textinput/textinput.go | 44 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)

diff --git a/go.mod b/go.mod
index c9dbf05..a10b7e6 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module github.com/charmbracelet/bubbles
 go 1.13
 
 require (
+	github.com/atotto/clipboard v0.1.2 // indirect
 	github.com/charmbracelet/bubbletea v0.9.1-0.20200713153904-2f53eeb54b90
 	github.com/mattn/go-runewidth v0.0.9
 	github.com/muesli/termenv v0.5.3-0.20200625163851-04b5c30e4c04
diff --git a/go.sum b/go.sum
index 444ddac..7432de1 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+github.com/atotto/clipboard v0.1.2 h1:YZCtFu5Ie8qX2VmVTBnrqLSiU9XOWwqNRmdT3gIQzbY=
+github.com/atotto/clipboard v0.1.2/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f h1:5CjVwnuUcp5adK4gmY6i72gpVFVnZDP2h5TmPScB6u4=
 github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f/go.mod h1:nOFQdrUlIlx6M6ODdSpBj1NVA+VgLC6kmw60mkw34H4=
 github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
diff --git a/textinput/textinput.go b/textinput/textinput.go
index 769abf6..2ea3ad9 100644
--- a/textinput/textinput.go
+++ b/textinput/textinput.go
@@ -5,6 +5,7 @@ import (
 	"time"
 	"unicode"
 
+	"github.com/atotto/clipboard"
 	tea "github.com/charmbracelet/bubbletea"
 	rw "github.com/mattn/go-runewidth"
 	"github.com/muesli/termenv"
@@ -126,6 +127,47 @@ func (m *Model) Reset() {
 	m.blink = false
 }
 
+// Paste pastes the contents of the clipboard into the text area (if supported).
+func (m *Model) Paste() {
+	pasteString, err := clipboard.ReadAll()
+	if err != nil {
+		m.Err = err
+	}
+	paste := []rune(pasteString)
+
+	availSpace := m.CharLimit - len(m.value)
+
+	// If the char limit's been reached cancel
+	if m.CharLimit > 0 && availSpace <= 0 {
+		return
+	}
+
+	// If there's not enough space to paste the whole thing cut the pasted
+	// runes down so they'll fit
+	if availSpace < len(paste) {
+		paste = paste[:len(paste)-availSpace]
+	}
+
+	// Stuff before and after the cursor
+	head := m.value[:m.pos]
+	tailSrc := m.value[m.pos:]
+	tail := make([]rune, len(tailSrc))
+	copy(tail, tailSrc)
+
+	// Insert pasted runes
+	for _, r := range paste {
+		head = append(head, r)
+		availSpace--
+		m.pos++
+		if m.CharLimit > 0 && availSpace <= 0 {
+			break
+		}
+	}
+
+	// Put it all back together
+	m.value = append(head, tail...)
+}
+
 // If a max width is defined, perform some logic to treat the visible area
 // as a horizontally scrolling viewport.
 func (m *Model) handleOverflow() {
@@ -322,6 +364,8 @@ func Update(msg tea.Msg, m Model) (Model, tea.Cmd) {
 			m.value = m.value[m.pos:]
 			m.pos = 0
 			m.offset = 0
+		case tea.KeyCtrlV: // ^V paste
+			m.Paste()
 		case tea.KeyRune: // input a regular character
 
 			if msg.Alt {